Big-bounce cosmology with spinor-torsion coupling

Details Big-bounce cosmology with spinor-torsion coupling Big-bounce cosmology with spinor-torsion coupling

2011-11-20

arxiv.org/abs/1111.4595v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages

Scientific paper

The Einstein-Cartan-Sciama-Kibble theory of gravity removes the constraint of general relativity that the affine connection be symmetric by regarding its antisymmetric part, the torsion tensor, as a dynamical variable. The minimal coupling between the torsion tensor and Dirac spinors leads to gravitational repulsion in fermionic matter at extremely high densities even without approximating it as a spin fluid. We show that such a repulsion replaces the unphysical big-bang singularity with a nonsingular big bounce that follows a contracting phase of the Universe. This scenario also naturally explains why the Universe today appears spatially flat, homogeneous and isotropic.

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